Coating composition and method for forming thin film on substrat

Details Coating composition and method for forming thin film on substrat Coating composition and method for forming thin film on substrat

1995-01-26

1996-04-23

Lusignan, Michael

Coating processes

Optical element produced

Transparent base

427356, 427380, 427428, B05D 506

Patent

active

055101410

ABSTRACT:
The invention relates to a method for applying a coating composition to a substrate with a reverse roller coater so as to form a thin film on the substrate and then for baking the thin film so as to transform the thin film into a metal oxide film. The coating composition comprises: 0.1-10 wt % of at least one organic metal compound on a metal oxide basis; and at least one organic solvent. The at least one organic metal compound is selected from the group consisting of metal alkoxides, metal acetyl-acetonates and metallic soaps. The coating composition is adjusted to have a viscosity within a range from 0.1 to 100 centipoises. In this method, a reverse roller of the coater is rotated at a rotation speed within a range from 2 to 55 m/min. and the substrate is moved at a moving speed within a range from 1 to 30 m/min. while the coating composition is applied to the substrate. Furthermore, the rotation speed of the reverse roller is adjusted to be higher than the moving speed of the substrate. According to the invention, it is possible to form an optical metal oxide film which has a uniform thickness of up to about 10 .mu.m (more particularly up to about 1 .mu.m).

REFERENCES:
patent: 4759949 (1988-07-01), Pavlik et al.

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